Articles: Cases/PSU

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It is equipped with the following cables and connectors:

  • Mainboard cable with a 24-pin connector (60cm)
  • CPU cable with a 4+4-pin connector (62cm)
  • CPU cable with an 8-pin connector (62cm)
  • Two graphics card cables with 6+2-pin connectors (56cm long)
  • One graphics card cable with a 6-pin connector (57cm)

  • One additional mainboard cable (56cm)
  • One cable with three Molex connectors (47+15+15cm)

  • One cable with three SATA power connectors on each (48+15+15cm)
  • Cable of the 135mm fan’s tachometer (81cm)
  • Two connectors for graphics card cables
  • Six connectors for cables of peripherals

Included with the PSU are:

  • Special adapter that makes the PSU compatible with certain mainboards; it provides +12V voltage to the mainboard’s 24-pin connector not from the PSU’s 24-pin plug but from a Molex plug.
  • Graphics card cable with a 6-pin connector
  • Adapter from an 8-pin CPU connector to a 6+2-pin graphics card connector
  • Additional (a third one!) CPU power cable with a 4-pin connector (45cm)
  • Four SATA power cables with three connectors on each (45+15+15cm)
  • Two cables with two Molex and one floppy-drive plug on each (45+15+15cm)
  • Two cables with three Molex connectors on each (44+14+14cm)

A pouch is provided for storing the cables, but the cardboard box they lie in by default seems to be more practical to me.

Thus, you can connect nearly anything to your Galaxy DXX. Considering the included adapters, the PSU offers five power connectors for graphics cards and a dozen SATA power connectors. Two things should be noted here. First, the additional mainboard connector is not very necessary (it is rare and identical to a Molex plug). And second, there is the adapter for ensuring the PSU’s compatibility with certain mainboards. Enermax is rather vague about its purpose but the design of the adapter suggests that it serves to redistribute the +12V supply. Running a little ahead, I have to confess that there were problems with the +12V load during my tests. The PSU would not start up if this load was lower than 100W (in my PSU tests the +12V load usually starts at 15-25W which is quite enough for stable operation of most PSUs).

The PSU is rated for a continuous output power up to 850W, 95% of which can be provided across the +12V rail divided into five “virtual” output lines. The lines are combined into two groups, each of which is served by a dedicated power transformer (as I wrote above, the PSU has two such transformers) with a max load of somewhat higher than 400W. Take note of the high load capacity of the +5V and +3.3V rails (up to 200W combined) and of the +5V standby source (up to 30W). It is not easy to load these rails so heavily in practice, however, so such a high load capacity is going to be redundant.

The PSU worked normally at loads up to 850W, but its protection woke up immediately when the load on the +12V rail was lower than 100W. That’s why the diagrams below begin with a load of 100-150W instead of 25-50W. I have to confess that this is not a problem of a specific sample. The earlier-tested Galaxy DXX 1000W would shut down at a load below 90W, too.

Together with an APC SmartUPS SC 620 this power supply worked at loads up to 340W and 330W when powered by the mains and batteries, respectively. They switched to the batteries without problems, and the UPS was stable at that.

The output voltage ripple is surprisingly low. It is far below the permissible maximum even on the +12V rail which bears most of the total load.

The +12V voltage is very stable (but as I mentioned above, the PSU’s protection was triggered when the load on that rail was lower than 100W). The +3.3V is 1% worse, yet only under extremely high loads. The +5V voltage sags noticeably, but does not leave the permissible limits, either. Anyway, a modern PC configuration loads the +5V rail by only a few dozen watts, so the deflection of this voltage is going to be no higher than 3%.

The PSU is 85% efficient. The power factor is 0.98. The numbers are good and coincide with the specifications, but don’t match the results of the best of modern PSUs.

The PSU’s fans are both connected to the same controller and have similar speed graphs as the consequence. The 135mm fan starts out at a modest 833rpm and has this speed at loads below 400W. Then it accelerates steadily. The 80mm fan behaves in a similar manner, but has higher speeds. It starts out at 1500rpm and accelerates to over 3000rpm at the maximum.

The PSU would be quiet if it were not for the 80mm fan. The latter creates an audible noise at high loads and the 135mm fan cannot be heard at all. So, the Galaxy DXX is average in terms of noisiness. It is good at low loads but noisy at high ones.

Summing it up, the Galaxy DXX 850W leaves an ambiguous impression notwithstanding its excellent selection of cables, high manufacturing quality and stable parameters. It has large dimensions and average level of noise and refuses to work with low loads. Therefore, it is not a good choice if your current PC configuration has a rather low power draw and you want to buy a PSU with a reserve of wattage for the future. Moreover, there are a lot of smaller models in the 850W category that are comparable or better than the Galaxy DXX 850W in terms of noisiness but work without problems at loads as low as 20W.

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